-

Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/DefaultDbMethod.cs

@@ -299,5 +299,10 @@ namespace SqlSugar
         {
             return "( " + fieldName + "=1 )";
         }
+
+        public virtual string Null()
+        {
+            return "NULL";
+        }
     }
 }

Src/Asp.Net/SqlSugar/ExpressionsToSql/DbMethods/IDbMethods.cs

@@ -53,5 +53,6 @@ namespace SqlSugar
         string GuidNew();
         string MergeString(params string[] strings);
         string EqualTrue(string value);
+        string Null();
     }
 }

Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/ConstantExpressionResolve.cs

@@ -55,7 +55,7 @@ namespace SqlSugar
                         if (value == null && parentIsBinary)
                         {
                             parameter.BaseParameter.ValueIsNull = true;
-                            value = "NULL";
+                            value = this.Context.DbMehtods.Null();
                         }
                         AppendValue(parameter, isLeft, value);
                     }